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<a name="beast.ref.boost__beast__ssl_stream.async_read_some"></a><a class="link" href="async_read_some.html" title="ssl_stream::async_read_some">ssl_stream::async_read_some</a>
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<p>
          <a class="indexterm" name="idm44861266432688"></a>
        </p>
<p>
          Start an asynchronous read.
        </p>
<h6>
<a name="beast.ref.boost__beast__ssl_stream.async_read_some.h0"></a>
          <span class="phrase"><a name="beast.ref.boost__beast__ssl_stream.async_read_some.synopsis"></a></span><a class="link" href="async_read_some.html#beast.ref.boost__beast__ssl_stream.async_read_some.synopsis">Synopsis</a>
        </h6>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">class</span> <a href="../../../../../../../doc/html/boost_asio/reference/MutableBufferSequence.html" target="_top"><span class="emphasis"><em>MutableBufferSequence</em></span></a><span class="special">,</span>
    <span class="keyword">class</span> <a href="../../../../../../../doc/html/boost_asio/reference/ReadHandler.html" target="_top"><span class="emphasis"><em>ReadHandler</em></span></a><span class="special">&gt;</span>
<a href="../../../../../../../doc/html/boost_asio/reference/asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type" target="_top"><span class="emphasis"><em>DEDUCED</em></span></a>
<span class="identifier">async_read_some</span><span class="special">(</span>
    <span class="identifier">MutableBufferSequence</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">buffers</span><span class="special">,</span>
    <span class="identifier">BOOST_ASIO_MOVE_ARG</span><span class="special">(</span><span class="identifier">ReadHandler</span><span class="special">)</span> <span class="identifier">handler</span><span class="special">);</span>
</pre>
<h6>
<a name="beast.ref.boost__beast__ssl_stream.async_read_some.h1"></a>
          <span class="phrase"><a name="beast.ref.boost__beast__ssl_stream.async_read_some.description"></a></span><a class="link" href="async_read_some.html#beast.ref.boost__beast__ssl_stream.async_read_some.description">Description</a>
        </h6>
<p>
          This function is used to asynchronously read one or more bytes of data
          from the stream. The function call always returns immediately.
        </p>
<h6>
<a name="beast.ref.boost__beast__ssl_stream.async_read_some.h2"></a>
          <span class="phrase"><a name="beast.ref.boost__beast__ssl_stream.async_read_some.parameters"></a></span><a class="link" href="async_read_some.html#beast.ref.boost__beast__ssl_stream.async_read_some.parameters">Parameters</a>
        </h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    Name
                  </p>
                </th>
<th>
                  <p>
                    Description
                  </p>
                </th>
</tr></thead>
<tbody>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">buffers</span></code>
                  </p>
                </td>
<td>
                  <p>
                    The buffers into which the data will be read. Although the buffers
                    object may be copied as necessary, ownership of the underlying
                    buffers is retained by the caller, which must guarantee that
                    they remain valid until the handler is called.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">handler</span></code>
                  </p>
                </td>
<td>
                  <p>
                    The handler to be called when the read operation completes. Copies
                    will be made of the handler as required. The equivalent function
                    signature of the handler must be:
                  </p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"> <span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span>
  <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">error</span><span class="special">,</span> <span class="comment">// Result of operation.</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">bytes_transferred</span>           <span class="comment">// Number of bytes read.</span>
<span class="special">);</span>
</pre>
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<h6>
<a name="beast.ref.boost__beast__ssl_stream.async_read_some.h3"></a>
          <span class="phrase"><a name="beast.ref.boost__beast__ssl_stream.async_read_some.remarks"></a></span><a class="link" href="async_read_some.html#beast.ref.boost__beast__ssl_stream.async_read_some.remarks">Remarks</a>
        </h6>
<p>
          The <code class="computeroutput"><span class="identifier">async_read_some</span></code> operation
          may not read all of the requested number of bytes. Consider using the
          <code class="computeroutput"><span class="identifier">net</span><span class="special">::</span><span class="identifier">async_read</span></code> function if you need to ensure
          that the requested amount of data is read before the asynchronous operation
          completes.
        </p>
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<td align="right"><div class="copyright-footer">Copyright © 2016-2019 Vinnie
      Falco<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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